CVE-2026-68145

Kernel memory corruption via zero-length bitmap write

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds write in Linux kernel iomap from 6.6 allows local users to corrupt kernel memory through a faulting write buffer. The dirty-range helper subtracts one from a zero length, underflows the block calculation, and passes a huge range to bitmap_set beyond the state allocation. Reachability requires a low-privileged local write, an already-uptodate folio, and a user-buffer fault; the result can corrupt memory or crash the host.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel iomap from 6.6 allows local users to corrupt kernel memory through a faulting write buffer. The dirty-range helper subtracts one from a zero length, underflows the block calculation, and passes a huge range to bitmap_set beyond the state allocation. Reachability requires a low-privileged local write, an already-uptodate folio, and a user-buffer fault; the result can corrupt memory or crash the host.

The record

CVE
CVE-2026-68145
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4ce02c67972211be488408c275c8fbf19faf29b3 <7037e7bdcd26f46c080b8ce307dee5cb471c4b7c
  2. Affected versionversion=4ce02c67972211be488408c275c8fbf19faf29b3 <9c7d8f7c8994c790fca501dc45ce66e7356cbe05
  3. Affected versionversion=4ce02c67972211be488408c275c8fbf19faf29b3 <c5b6a48a8a716a7730e39af1cad083dc4ec955ce
  4. Affected versionversion=4ce02c67972211be488408c275c8fbf19faf29b3 <fb4fad9105c88b1d82f1b3c39e3b6abea8249af6
  5. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4ce02c67972211be488408c275c8fbf19faf29b3 <7037e7bdcd26f46c080b8ce307dee5cb471c4b7c; version=4ce02c67972211be488408c275c8fbf19faf29b3 <9c7d8f7c8994c790fca501dc45ce66e7356cbe05; version=4ce02c67972211be488408c275c8fbf19faf29b3 <c5b6a48a8a716a7730e39af1cad083dc4ec955ce; version=4ce02c67972211be488408c275c8fbf19faf29b3 <fb4fad9105c88b1d82f1b3c39e3b6abea8249af6; version=6.6

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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